Wire netting for paper-making machines and method of making the same



April 12,1921;

6. KURTz-HAHNLE ET AL WIRE NETTING FOR PABER MAKING MACHINES AND METHGDOF MAKING THE SAME Fil'd June-14. 1926 Patented Apr. 12,1927." I

UNITED STATES PATENT OFFICE.

CARL KURTZ-HAHNLE AND HA NS KURTZ OF REUTLINGEN, GERMANY.

Application filed June 14, 1926, Serial No. 116,008, and in GermanyOctober 26, 1925.

Our invention relates to wire netting for paper making machines andmethod of making the same, these-called F ourdrinier wlres which aremade of wire cloth; It is an objcct-of our invention to clin'linate thepresent excessive wear and short life in modern high-speed machines, andto this end we arrange the seam or seams of such Fourdrinler wires at aninclined angle to their longitudinal direction.

The excessive wear referred to occurs principally at the suction boxes.The faster the rate at which the machine is operated, the higher will bethe vacuum in the suctlon boxes and as the Fourdrinier wire isintermediate between the vacuum chamber in the suction box and the Web,it will be drawn down to said boxes at a proportionate pressure. As atthe same time it moves rapidly past said boxes, each chain thread willwear a groove into the covers of thesuction boxes. At the seam, thechain wires are not registering with the chain wires in the unbrokenreaches of the F ourdrinier wire but assume intermediate positions sothat at the seam the wire cloth is raised from the grooves it has wornand this may cause a jerk of such intensity that the web is frequentlybroken at the suction box. At the same time, the jerk causes wear to theseam and brings about an early failure of the Fourdrinier wire.

vention by arranging the seam not at right angles but at an inclinedangle to the longitudina] extension of the wire so that it graduallymoves across the suction box, starting at one end and thus avoiding thesudden jerk to which the usual Seam at right angles is submitted.

Seams at an inclined angle may be. obtained in various ways. Thesimplest solution is that of staggering both ends of the Fourdrinierwire for. the pitch of several Wires and removing the projecting edges.In comparatively long Fourdrinier wires, several seams are arranged instaggered relation as described so as to obtain the inclination which isdesirable for the given case.

Another expedient is weaving the wire cloth on the loom in setting ingradually single chain wires, pairs or groups of chain wires so as toreduce the width of the cloth at one edge and increase incorrespondingly atthe other. In this manner the Wire cloth Thesedrawbacks are overcome in our inis distorted diagonally and has aninclined regulate the-motion of the wire as usually;

In the drawings, we have illustrated two modifications of FourdrinierWires embodying our invention.

Referring first to Fig. 1, a is an endless Fourdrinier ire and b is itsinclined seam.

Referring now to Fi 2, this shows a Fourdrinier wire a" with chain wires0 and seams d. It will appear from this figure that as many chain wiresare eliminated on one side of the wire as have been added on the other.

\Ve claim:

1. As a new article of manufacture, a wire cloth or F ourdrinier wirefor paper making machines comprising a seam extending at an inclinedangle 0 the direction in which said wire is moving through the machine.

2. As a new article of manufacture, a wire cloth or F ourdrinier Wirefor paper making machines comprising a plurality of seams extending atan inclined angle to the direction in which the wire is moving throughthe machine.

3. As a new article ofv manufacture, a wire cloth or Fourdrinier wirefor paper making machines comprising ends staggered at the seam so thatthe seam becomes inclined to the direction in which said wire is movingthrough the machine.

4. As a new artlcle of manufacture, a wire 'cloth or Fourdrinier wirefor paper making machines comprising chain wires addedon one slde of thewire and a corresponding number of chain wires withdrawn on its oppositeside so that the seam becomes'in clined to the direction in which saidwire is moving through the machine.

5. As a new article of manufacture a wire cloth or Fourdrimer wire forpaper making 'machines comprisingchain Wires added on one side ofthewire in groups of at least two wires each, and a corresponding number ofgroups Withdrawn on the, other side, so that the seam becomes inclinedto the direction in which said wire is moving through the machine. v

6. A method of making wire cloth or Fourdrinier Wire for paper makingmachines consisting in staggering the ends of the Wire at the seam so asto obtain a seam inclined at an angle to the directionin Which the Wirecloth is moving through the machine.

7. A method of making Wire cloth or Fourdrinier Wire for paper makingmachines consisting in adding chain Wires on one side of the Wire andwithdrawing a corresponding number of chain Wires on the opposite sideso as to obtain a seam inclined at an angle to the direction in whichthe Wire cloth is moving through the machine.

CARL 'KUR'rz-HAHNLE. HANS KURTZ.

